/*
 * Copyright 2020 eBlocker Open Source UG (haftungsbeschraenkt)
 *
 * Licensed under the EUPL, Version 1.2 or - as soon they will be
 * approved by the European Commission - subsequent versions of the EUPL
 * (the "License"); You may not use this work except in compliance with
 * the License. You may obtain a copy of the License at:
 *
 *   https://joinup.ec.europa.eu/page/eupl-text-11-12
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
export default function isUniqueDirective($timeout, $q) {
    'ngInject';

    return {

        // limit usage to argument only
        restrict: 'A',

        // require NgModelController, i.e. require a controller of ngModel directive
        require: 'ngModel',

        scope: {
            ebUnique: '&'
        },

        // create linking function and pass in our NgModelController as a 4th argument
        link: function(scope, element, attr, ctrl) {
            $timeout(function() {
                element[0].focus();
            });
            ctrl.$asyncValidators.unique = function(modelValue, viewValue) {
                if (ctrl.$isEmpty(modelValue)) {
                    // consider empty models to be valid
                    return $q.when();
                }
                return scope.ebUnique({name: viewValue});
            };
        }
    };
}
